Operative

1. The following chemically bond to the tooth: a. Composite resin.b. Dental sealants.c. Glass ionomer cement. ***d. All of the above.

2. Compomer restorative materials are: a. Glass ionomer with polymer componentsb. Resin systems with fluoride containing glasses. ***c. Composite resin for cervical restorations only.

The composition of compomers is similar to that of a dental composite however it has been modified, making it a polyacid-modified composite. This results in compomers still requiring a bonding system to bond to tooth tissueAlthough the name compomer implies that the material possesses a combination of characteristics of both composite and glass ionomers, these materials are essentially polymer-based composites that have been slightly modified to take advantages of the potential fluoride-releasing behavior of glass ionomers.

3. Loose enamel rods at the gingival floor of a class II amalgam cavity should be removed using :

a. Straight chisel. إزميلb. Hatchet. فأسc. Gingival curetla. كاشطةd. Gingival marginal trimmer. *** مشذب

Dental Decks - page 2180Gingival marginal trimmers are primarily used for beveling gingival margins, and rounding or beveling of the axiopulpal line angle of Class II preparations.

المواشير يوازي الشطب أن حيث الضعيفة الميناء إزالة أي الشطب تعني األولى الجملةالمينائية.

Art and science of operative dentistry 2000 – page 315The gingival margin trimmer is designed to produce a proper bevel on gingival enamel margins of proximoocclusal preparations.

4. Removal of Undermined Enamel in Class II cavity is done by : A) Chisel. ***B) Angle formerC) ExcavatorPROXIMAL (CLASS II):A chisel can be used to plane away unsupported enamel from the margins of the completed preparation to produce a 90° butt joint.

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5. Hand instrument which we used to make internal angles retentive grooves and preparation of cavity walls in the cavity is:

a. Angle former. ***b. Chisel إزميلc. Filed. Enamel hatched

A special type of excavator is the angle former. It is used primarily for sharpening line angles and creating retentive features in dentin in preparation for gold restorations.

Retention grooves are placed with a No 1/2 or 1/4 bur.( يدوية وغير آلية (كأداة

6. What is the cavo-surface angle of prep for amalgam restoration: a. 30 degreeb. 60 degreec. 90 degree ***d. 130 degree.

.7. To provide maximum strength of amalgam restoration the cavo-surface angles should: 1. Approach 75 with outer surface.2. Approach 90 with outer surface.3. Be supported by sound dentine.4. Be located in area free of occlusal stress.a) 1+3 and 4.b) 1+3.c) 2+3+4. ***d) 3+4.

8. Which of the following materials has been shown to simulate reparative dentine formation most effectively when applied to the pulpal wall of a very deep cavity:

a. Copalite varnish.b. Calcium hydroxide preparation. ***c. Zinc phosphate cement.d. Anhydrous class inomer cement.

9. Calcium hydroxide is best pulp capping material because: 1. It has best seal over pulp.2. It is alkaline + less irritating to pulp.3. It induces reparation dentine formation. ***

10.Clinical failure of the amalgam restoration usually occurs from: a. Improper cavity preparation ***b. Faulty manipulation.c. Both of the above d. None of the above

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11. It has been proven that amalgam restoration has the following characteristics: a. Micro leakage decrease with aging of the amalgam restoration.b. It is the least techniques sensitive of all current direct restorations.c. High dimensional changes.d. A, b and c.e. A and c.f. A and b. ***g. B only.

- During electrochemical corrosion of low-copper amalgams, The Sn-Hg phase is oxidized into Sn-O and/or Sn-O-Cl. The oxychloride species is soluble. The oxide Precipitates as crystals and tends to fill up the spaces Occupied by the original Sn-Hg phase. Along the margins Of the amalgam, Sn-O helps seal the space against Microleakage.- During setting, most amalgams undergo very little Dimensional change.- The dimensional change during the setting of amalgam is one of its most characteristic properties. Modern amalgams mixed with mechanical amalgamators usually have negative dimensional changes.- The only exception to this statement is the excessive delayed dimensional change resulting from contamination of a zinc-containing alloy with water during tritura-tion or condensation.

12.When polishing the amalgam restoration: a. Avoid heat generation by using wet polishing paste.b. Wait 24 hours.c. A and b. ***d. B only.e. A only.

13.Maximum time elapsed before condensation of amalgam after titration: a. 1minute.b. 3minutes. ***c. 9minutes.

14.After amalgam titrations, the mix should be placed within: a. 1 min. ***b. 3 min. ***c. 5 min.15.MOD amalgam restoration with deep mesial box, PT come with pain related to it

after 1 month due to: a. Pulp involvement. ***b. Supraocclusion.c. Upon contact.d. Gingival recession.

16.Reduction in amalgam restoration should be: a. 1-1.5 mm.b. 1.5-2 mm. ***c. 2-3 mm.

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d. 3-5 mm."it must have a minimum thickness of 0.75 to 2 mm (because of its lack of compressive strength)"

17.Depth of amalgam restoration should be: 1. 1 – 1.5 mm.2. 1.5 – 2 mm. ***3. 2 – 3 mm.4. 3 – 5 mm.

18.Silicate cement: a. First tooth colored restoration.b. It can be used as permanent filling.c. It contains 15 % fluoride.d. A, b and c.e. 1 and 2.f. A and c. ***g. A only.

اإلجابة صحة يؤكد ما موجودا الثاني الخيار يكن لم و السؤال ورد االختبارات أحد فيالسابقة

Silicate cement , the first translucent filling material, was introduced in 1878 by Fletcher in Englanddental material & thier selection2002

السيلكات إسمنت فلورايد 25-12يحتويDental Decks part2 2007-2008 - page2066ZOE,reinforced ZOE, ZOE-EBA, Silicate and zinc phosphate cements are no longer routinely used to permanently cement restorations

19.Length of pins must be equals in both tooth and restoration by a depth of: a. 1 mm.b. 2 mm. ***c. 3 mm.d. 4 mm.

العاج من كل ًفي متعادال العاجي الدبوس انغماس يكون أن يجب المراجع جميع حسبوبمقدار .2والحشوة ملم

20.Stainless steel pin is used in amalgam for: a. Increase retention. ***b. Increase resistance.c. Increase streangth.d. A and b.

. المقاومة وينقص األملغم يضعف ولكن الحشوة ثبات الوتد يزيد حسب

21.What can we use under composite restoration: a. Ca (oh). ***b. ZOE.c. ZINC phosphate cement.

22.The x- ray of choice to detect the proximal caries of the anterior teeth is: a. Periapical x-ray. ***

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b. Bitewing x-ray.c. Occlusal x-ray.d. None of the above.

فقط للخلفية المجنحة23.What is the copper ratio that eliminates gamma phase 2: a. 2% copperb. 4% copperc. 10 % copperd. 13 % copper ***

to prevent discoloration under amalgam filling : a- use Zn phosphate boxb- use cavity varnishc- wash the cavity with NaOCL b4 fillingd- use the correct amalgam-alloy ratio

24.Polishing bur have: a. Less than 6 blades.b. 6-7 blades.c. 10-12 blades.d. More than 12 blades.

شفراتها عدد ولذلك ناعمة تكون أن يجب الكومبزت إنهاء .20-12سنابل

25.Rubber dam is contraindicated in: a. Pt with obstructive nose. ***b. Mentally retarded Pt.c. Un comparative child.d. A and b.

26. Pt complain from pain in 45 whitch had gold onlay. The pain could be due to: a. Chemicals from cement. b. High thermal conductivity of gold. ***c. Related to periodontal ligament.d. Cracked tooth or fractured surface.

Dental Decks - page 2134Disadvantages of gold restoration:Esthetics – cost – time consuming – difficulty of technique – the need to use cement (the weakest point in the cast gold restoration) – gold has high thermal conductivity.

27. الجواب ن يكون فقط المضغ أثناء األلم لكن و السابق السؤال فس

a. Related to periodontal ligament.

28.Class II composite resin is lined by: a. G.I. ***b. Reinforced ZOE.c. ZOE with epoxy cement.Cavity varnish

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29. In cavity preparation, the width of the cavity is: a. 1/2 inter cuspal distance.b. 1/3 inter cuspal distance. ***c. 2/3 inter cuspal distance.

30.Selection of shade for composite is done: a. Under light.b. After drying tooth and isolation with rubber dam.c. None of the above. *** . في التغيرات وتالحظ قطنة توضع اللعاب وبوجود الطبيعي بالضوء يكون اللون اختيار

. مضيء أو معتم وسط في المريض يكون عندما السن لون31.Most commonly, after placement of amalgam restoration PT. Complain from pain

with: a. Hot.b. Cold. ***c. Occlusal pressure.d. Galvanic shock.e. Sweet.

32.Calcium hydroxide is used in deep cavity because it is: a. Simulate formation of 2nd dentine. ***b. Not irritant to the pulp.c. For thermal isolation.

العزل أن كما اللب، من المقابلة الجهة في صغير تموت الكالسيوم ماءات تحدث بالواقعالثانوي العاج انتاج على فتحرض الكالسيوم ماءات أما االسمنت، مهمة هو الحراري

. الكيميائي العزل وتؤمن

33. In placement of rupper dam: المطاطي الحاجزa. 4 jaw contact in teeth.b. Only 4 contacts 2 lingual surface and 2 buccal surface. ***c. Only 4 contacts 2 mesial and 2 distal.

34.7 days after amalgam restoration Pt came complaining of pain during putting spoon on the restored tooth because:

a. Irreversible pulpitis.b. Reversible pulpitis.c. Broken amalgam.d. Galvanic action. ***35.Filling amalgam in the first madibular molar when touch the spoon there is a pain

the reason is:Galvanic action. ***

36.The aim of conditioning agent on dentine before GI cement is to remove smear layer: a. True. ***b. False.

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37.Compomer release fluoride as GI: a. True.b. False. ***

ليعيد األسنان معجون فلور يمتص ال كما أقصر ولفترة أقل بكمية الفلور الكمبومير يحررتحريره.

38.PT feel pain of short duration after class II restoration. Diagnosis is: a. Reversible pulpitis (hyperemia). ***b. Irreversible pulpitis.c. Periodontitis

39. In the preparation of cavity class II, for restoration with composite resin all cavosurface angles should be

a. Well rounded. ***b. Right angles.c. Acute angles.d. Obtuse angles.

40.Selection of shade for composite is done: a. Under light.b. After drying tooth & isolation with rubber dam.c. None of the above. ***

41.A class IV composite resin restoration should be finished with a: a. No. 330 Tungsten carbide bur.b. Mounted stone.c. 12- fluted carbide bur. ***d. Coarse diamond point (stone).

The 12-fluted carbide burs (#7901, #7804 ET series) have traditionally been used to perform gross finishing of resin composites.

42. In class 5 composite restorations a layer of bonding agent is applied: 1. Following removal of cement then cured. ***2. Following removal of cement and not cured.3. Cured then remove cement.

After class V GI restoration removal of a thin flush of GI is done by: a. Scaller or knife immediately.b. Finishing stone immediately.c. Scale or knife later.d. Finishing stone later.e. A+B.f. A+D. ***

43.After finish class v glass ionomer cement we do finishing with: 1. Pumice slurry.2. Aluminum-oxide disc.Micron finishing diamonds used with a petroleum lubricant to prevent desiccation are ideal for contouring and finishing conventional glass ionomers.

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Also, flexible abrasive discs used with a lubricant can be very effective. A fine grit aluminum oxide polishing paste applied with a prophy cup is used to impart a smooth surface.

44. Indirect composite inlay has the following advantages over the direct composite EXCEPT:

a. Efficient polymerization.b. Good contact proximally.c. Gingival seal. ختمd. Good retention. ثبات ***

45. Indirect composite inlay has the following advantages over the direct composite EXCEPT:

a. Efficient polymerization.b. Good contact proximally.c. Gingival seal. ختمd. Price ***

46. Indirect composite inlay over come the direct composite by 1/ insusffition polymerization2/good contact proximaly3/ gingival seal4/ good retentiona/ 1-2-4b/ 1-2-3. ***c/ 4-3

47.A glossy finish is best retained on a: a. Microfilled composite resin restoration. ***b. Macrofilled resin restoration.c. Hybrid composite resin restoration.d. Fiber reinforced composite resin restoration

Dental decks 2 page 2100Microfill(fine particle composite) 0.01-0.1 *** develop smoothest finish.Fundamentals of operative dentistry, a contemporary approach, 2nd edition, Microfilled resin composite can be polished to the highest luster and smoothest surface of all the resin composites,

48.Composite for posterior teeth: a. Microfilled + fine filler.b. Macroflled + rough filler.c. Hybrid + rough filler. ***

The strength and other physical properties, EXCEPT wear resistance and surface roughness, of macrofilled composites are adequate for Class III, IV, and V restorations. Excessive wear when used for Class I and II restorations limited their posterior use. Macrofills were used before dentinal bonding systems were developed; placing them in posterior teeth resulted in postoperative sensitivity, leakage, and recurrent decay.

The problem with microfilled composites is the low percentage filler (40–50%). The surface area of the very small filler particles requires much more resin to wet the

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surface of the filler particles. This high resin content results in an increased coefficient of thermal expansion and lower strength.

Microfilled composites were used when esthetics are the dominant concern. Large composite restorations, such as an extensive Class IV restoration, are built in layers of several different shades and translucencies. The first layers to be placed are a hybrid composite selected for strength. The final layer, a veneer of sorts, is a microfilled composite selected for surface luster.Microfilled composites are also used in Class V restorations at the cemento–enamel junction. Microfills have a lower modulus of elasticity and flex with the tooth better than the strongest composite materials. Clinical research has shown Class V microfill composite restorations are more likely to be retained than other composite materials.

Hybrid composites are very popular; their strength and abrasion resistance are acceptable for small to medium Class I and II restorations. Their surface finish is nearly as good as that of microfills; thus, they are also used for Class III and IV restorations.

49.For etching 15 sec, for composite restoration use: a. 37% phosphoric acid. ***b. 15% fluoric acid.c. 3% sulfuric acid.

50. after class II amalgum fill , broken is happen in isthmus area why A. over high of filling virticallyB. over flair cavosurface angle or edge C. unproper mixed fill

51.Small caries confined to enamel: a. Preventive measure. ***b. Amalgam feeling.c. Keep under observation.

In enamel caries passing half of enamel: a. Leave it.b. Restoration. ***

52.At which location in enamel is the density of enamel crystals is lowest: a. Prismless enamel. موشوري الال الميناءb. DEJ. *** المينائي العاجي الملتقىc. Center of enamel Prisms. الموشوري الميناءd. Edge of enamel Prisms.e. Facial enamel.

Rampant caries in adult in anterior teeth restored by: الهائجة أو المعممةa. Glass ionomer. ***b. ZOE.c. Amalgam.

53.Most of dentine bonding material need conditioning time:

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a. 15 sec. ***b. 30 sec.c. 45 sec.d. 60 sec.

54.Time of curing of dentine: a. 10 sec.b. 15 sec.c. 30 sec. ***d. 60 sec.

55.Light curing time for simple shallow class III composite: a. 10 sec.b. 15 sec.c. 20 sec. ***

56.Cavity varnish should be applied at least in: a. One layer.b. Two layer. ***c. Three layer.d. Four layer.

57.During placement of amalgam pins, the number of pins per cusp is: a. 1 pin. ***b. 2 pins.c. 3 pins.d. 4 pins.

58.The cause of fracture in amalgam class II restoration is: a. Thin thickness at the marginal ridge. ***b. Wide flared cavity c. Deep cavity.

الخطية" الزاوية شطب على التأكيد مع الحدبتين بين المسافة ثلث البرزخ عرضذرى ألن اللب انكشاف من الخوف دون للترميم كافية ثخانة لتأمين اللبية المحوريةاألملغم ثخانة زيادة وبالتالي الحفرة فتعميق الحدبات، ذرى تحت تتوضع اللبية القرون

" البرزخ عرض زيادة مع بالمقارنة أضعاف ثالثة مقاومته يرفع

59.Contact area is in incisal/occlusal 1/3 in which tooth: a. Mandibular incisors. ***b. Mandibular molars.c. Maxillary molars.

60. Incipient caries is diagnosed by: a. Fiber optic light. ***b. Tactile examination.c. X-ray film.

)And dye(

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61.The spontaneous production of an electric current resulting from two dissimilar metal in the oral cavity is called:

a. Nuclear reaction.b. Galvanic action. ***c. Precipitation reaction. ترسيب تفاعلd. Thermodynamics.

Fission .انشطار

62.One week after filling of class II restoration, the Pt present with a complain of tenderness on mastication and bleeding from the gingival. The dentist should initially:

a. Check the occlusion.b. Check the contract area. ***c. Consider the probability of hyperemia.d. Explain to the Pt that the retainer irritated the surrounding soft tissue and prescribe an

analgesic and warm oral rinse.

63.Which one of the following is not a characteristic of dentinal hypersensitivity: a. It is one of the most successfully treated chronic dental problems. ***b. Its prevalence range from 8 to 30%.c. The majority of the Pts who experience it are from 20 to 40 years of age.d. One source of the irritation that leads to hypersensitivity is improper tooth brushing.

القواطع – أعناق وفي والرابع الثالث العقدين في العاجية الحساسية فرط تزداد. السكاكر – أو بالتفريش مقارنة البرودة ومع والضواحك

. العاجية األقنية نفوذية تقليل عند الحساسية لنقص أشارت الدراسات معظمDentin hypersensitivity is a common clinical condition that is difficult to treat because the treatment outcome is not consistently successful.

64.Hypersensitivity is due to: A- Exposed dentine with opened dentinal tubules. ***B- Obliterated dentinal tubule

65.The function of the anterior teeth is: a. Disarticulate the posterior teeth. تشابك انفكاكb. Incise food. ***c. Prevent attrition. باالحتكاك التآكل منعd. Prevent food impaction.

In geriatrle Pt, Cementum on the root end will: Become thinned and almost nonexistent.

a. Become thicker and irregular. ***b. Render apex to locater useless.c. Often not be seen on the radiograph.

Indicate pathosis.

66.Hydrogen peroxide is the ideal bleaching agent because: a. It bleaches effectively at natural ph.b. It bleaches faster than carbamide peroxide.c. Protection for sensitive tissues can be incorporated into the hydrogen gel.

ضمانها يمكنd. All of the above. ***

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67.Which statement concerning sensitive teeth is false : a. Small dentin exposure can result in sensitivity.b. The extent of dental hard tissue loss always correlates with sensitivity. c. A wide variety of clinical condition can cause teeth to become sensitive.d. Oral hygiene habits and diet can contribute to clinical sensitivity problems.

ومع ثانوي عاج تشكل مع ً أحيانا يترافق فهو الحساسية ً دوما السن نسج ضياع يسبب ال. بالعمر التقدم

68.Dentine hypersensitivity is best relieved or controlled by: a. Using efficient cooling system. فعالb. Blacking exposed tubules on the dentin surface. ***c. Opening tubules to permit release of intrapulpal pressure.d. Applying anti inflammatory agent to exposed dentin.

69.When you do amalgam finishing..... a. Immediately.b. 24 hours later. ***

70.When polishing amalgam restoration . a. Avoid heat generation by using wet polishing pasteb. Wait for 24 hoursc. A & b. ***d. A only e. B only

71.How can you prevent dental hyper sensitivity: a. Restoration by adhesion. ***b. Controlled by alcoholc. Put sedative medication

72.The following cavity bases are moisture sensitive: a. Polycarboxylateb. Zinc phosphatec. GI cem. ***d. ZOEe. A, c.

. الماء المس لو مما الهواء مع بتماس كان إذا أكثر يتقلص الزنك فوسفات. القصير العمل وزمن السماكة الزنك كاربوكسيالت بولي مساوىء

Glass ionomer cements are very sensitive to contact with water during setting. The field must be isolated completely. Once the cement has achieved its initial set (about 7 minutes), coat the cement margins with the coating agent supplied with the cement.

Which of the following types of base materials can be placed in contact with polymethyl methaacrylate & not inhibit the polymerization of the resin: a. ZOEb. GI cementc. Zn phosphate cementd. Varnish

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e. B, c. ***

73.Cement which contains fluoride: a. GI. ***b. ZOE.c. Reinforced ZOE.d. Polycarboxylate cement.

74.Marginal deterioration of amalgam restoration should be due to: a. No enough bulk of dentine. قليلة عاج كميةb. Corrosion. تآكلc. Over carving. زائد نحتd. Improper manipulation of amalgam. مناسب غير تعاملe. A and b.f. C and d.g. All the above. ***h. B, c and d.

Amalgams that are corroded or have inadequate bulk to distribute stresses may fracture. At margins, where amalgams are thinner, extrusion may have occurred, and corrosion may have compromised the integrity of the amalgam, fracture is even more likely.

75.A restoration of anterior teeth with RCT, abraded incisal edge & small M&D caries is by:

a. Ceramometal crown. ***b. Composite laminated.c. Veneer.d. None of the above.

76.The powder for GI cement contain: a. Sio2, Al2o3, caf. ***b. Sio2,zno, barium sulphatec. None of the above.

GIC Powder: Silica 41.9% - Alumina 28.6% - Calcium Fluoride 15.7% - Sodium Fluoride 9.3% - Aluminium Phosphate 3.8% - Aluminium Fluoride 1.6%

77.Proximal caries should be opened when: a. Confined within enamel…. b. Pass DE junction. ***c. Dentin laterallyd. All of the above

العاجي المينائي للملتقى وصوله عند النخر سرعة تزداد

78. In a study, it should??? األبحاث فيa. Protect you against role of the statisticianb. Protect you against legal risksc. Protect against physical risks.

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79.Most common bacteria causing caries: Streptococcal mutans. ***

80.Proximal caries confined to enamel: a. Prevention. ***b. Observationc. Restore with G I

In community diagnosis and treatment program: a. Water flouridationb. ?? Diagnose, prevent, treat. ***

81.The cement under MOD amalgam have this character: a. High modulus of elasticity(stiff)*** عالي مرونة معاملb. Low modulus of elasticity ( stiffness) منخفضc. The high modulus of elasticity prevent of bonding and decrease tensile strength. عامل

الشد جهود وينقص االلتصاق تمنع العالي المرونةd. Both a &c

المادة صالبة زيادة على تدل المرونة عامل واللي Stiffnessزيادة للثني ومقاومتهاFlexibility

82.Both glass ionomer & polycarpoxylate cement contain: a. Polyacrylic acid. ***b. ZOE powder.

83.Most common cyst oral cavity: a. Radicular cyst. جذرية كيسةb. Peridontal cyst. سنية حول كيسة

ظهارتها التهابية كيسة وهي متموت لسن ثانوية قناة مصدرها الجانبية الجذرية الكيسة( ) . سني التهاب الذروية وحول الذروية كالكيسة مالسية بقايا من مشتقة

األرحاء بين ً وغالبا السنية الصفيحة بقايا من ظهارتها الجانبية السنية حول الكيسة( ) . لثوي التهاب الحية السفلية

84.Dentinogenesis imperfecta have all EXCEPT: العاج تصنع سوءa. Broken enamel.b. Blue sclera.c. Broken bone.d. Supernumerary teeth. ***

Symptoms of Dentinogenesis imperfecta, type IThe list of signs and symptoms mentioned in various sources for Dentinogenesis imperfecta, type I includes the 14 symptoms listed below: • Bluish-gray teeth - Amber-colored teeth - Bulbous teeth crowns • Absent tooth roots – canals - pulp chambers • Too small tooth roots - canals - pulp chambers • Enamel separation from the ivory (dentin) • Misaligned teeth - Recurring dental abscess - Brittle bones - Blue sclera

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85.Generalized gray discoloration in a 28 years old patient’s teeth, with blue sclera and an enlarged pulp chambers and short roots, and multiple fractures in Enamel… the diagnosis is :

A) Dentinogenesis Imperfecta. ***B) Amelogenesis Imperfecta

Type I and II show total obliteration of the pulp chamber.Type III shows thin dentin and extremely enormous pulp chamber.These teeth are usually known as Shell Teeth

Type 1: Roots are short, blunt and conical. In deciduous teeth, pulp chambers and root canals are completely obliterated in permanent they may be crescent shaped.Type 2: The pulp chamber of the deciduous teeth become obliterated in deciduous teeth. While in permanent teeth, large pulp chamber is seen in coronal portion of the tooth - referred to as thistle tube appearance.Pulp stones may be found.

86.30 years old pt came to the clinic with brownish discoloration of all his teeth (intrinsic discoloration) & yellowish in U/V light the most likely cause is: 1/ flourosis2/ tetracycline. *** 3/ amelogensis imperfecta4/ dentogensis imperfectea

87.Pins are insert into: a. Enamel.b. Dentin. ***c. Enamel and dentin (DEJ).d. Any of the above .

طوله يكون أن والحشوة 2ويجب العاج في المينائي 1ويبعد ملم الملتقى عن ملمالعاجي

88.After etch enamel and bond it with 5th generation the strength of? a. 5-10Mp.b. 25Mp.c. 30Mp.d. 100Mp.

حتى 35والعاج89.Composite restoration that was matching in shade, after one week it became much

light... The reason could be: a. ………light started photoinitation.b. Absorption water.c. Shade selected after rubber dam. ***

90.Disadvantage of digital x-ray EXCEPT: a. Large disk space Storageb. Clarity and resolution. ***c. Expensive

. بالصورة التحكم إمكانية الرقمي التصوير مميزات من91.Zinc phosphate cement:

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a. Mechanical attachment ***b. Chemical

92.Traditional Glass ionomer: a. Mechanical bonding.b. Acid-base reaction ***c. -Mechanical chemical bonding.

كربوكسيالت وبولي أينومير غالس بعكس ً ميكانيكيا السن إلى يرتبط الزنك فوسفات. ً كيميائيا يرتبطان الذين الزنك

The vertical fracture of the tooth detected by .periodontal pocket. ***.radiographically.vertical percussion

1. Transillumination with fiberoptic light2. Persistent periodontal defects in otherwise healthy teeth3. Wedging and staining of defects4. Radiographs rarely show vertical fractures but do show a radiolucent Defect laterally from sulcus to apex (which can be probed).Vertical FractureA vertical fracture of a tooth may result in communication between the gingival sulcus (oral cavity) and the apical periodontium. The fracture line will be a portal of entry for bacteria from the mouth into the tissues, causing inflammation and bone destruction. A periapical lesion often forms which may have the appearance radiographically of a pulpally related lesion. Since a vertical fracture may be incomplete, its diagnosis in many instances is extremely difficult. Sometimes it is recognized clinically because a periodontal pocket forms along the fracture line and in other instances a simple exploratory surgical procedure may aid in establishing the correct diagnosis.

93.Pain of short duration with hot and cold .dentin sensitivity. ***.irriversible pulpitis..chronic pulpitis.apical periodontitis

shade guide :Under lightDry tooth

None of above*** .

94.Organism that initiates caries: a. S. Mutants. ***b. …c. …

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95. Incipient cariesa. Surface zone is relatively unaffected. *** b. The surface zone is the largest portion with the highest pore volume c. Tooth preparation and composite is the best treatment.D. Pulpal reaction is not possible.E. Caries progress in enamel faster than dentin.

Surface zone relatively unaffected by the carious attack

96.The depth of cavity prep for composite in posterior: a. Limited to enamelb. 0.5 mm in dentinc. Depends on caries extension ***d. Depends on tooth discoloratione. 0.2 mm in dentin

97.GIC compared to composite: a. Increase linear coefficient of Thermal Expansion

B. More wear resistantc. Less solubled. Stiffe. Polymerization shrinkage ***

: الحراري التمدد عامل في أقل األينومير الكومبوزت مع )بالمقارنة والعاج( للميناء مماثلو وأقل للماء امتصاص وأكثر لالهتراء ً لكن مقاومة كيميائيا يرتبط ألنه حفافي تسرب أقل

. السن لجدران

98.Dentine permeability increases a. Coronal less than root dentine. ***b. Permeability increase toward DEJ.C. Permeability increase toward bcj.

ومن ، المحورية السطوح إلى اإلطباق منطقة من باالنتقال العاجية القنيات عدد يزداد. اللب باتجاه العاجي المينائي الملتقى ومن الجذر، إلى التاج

99. restoring lost tooth, which is least important: a. Estheticb. Pt demand ***c. Functiond. Arch integrity and occlusal stability

100. Enamel tufts area. Extensions of odontoblasts in the DEJ b. Enamel rods change their direction.C. Enamel rods get crowded ***

المينائية المواشير فيها تزدحم التي المنطقة في تتشكلArrange the steps [ca(oh)2 placing –varnish-base –amalgam

Retention of amalgam depends on a-amalgam bondb- convergency of walls oclusally ***

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c- divergency of walls oclusallyd- retentive pins

101. Since in composite tooth prep should be conservative so the design a-amalgam in moderate and large cavitiesb_beveled amalgam margines......C-conservative restorations. *** : أن يجب التحضير فإن محافظة حشوات هي الكمبوزيت حشوات أن بما السؤال معنى

. الميازيب وفي النخر امتداد بقدر ً محافظا يكون( عبيدة ( بالسؤال لهم عالقة ال الثاني و األول االحتمالين أن أعتقد

102. preparation of all incipient cavity within enamel Acquired pelliclea- structures layer protect tooth. ***b- aid in remineralization

103. During the orthodontist removes orthodontic braces he noticed white hypocalcific lesion around the bracket what to do: 1- microabration and application of pumice then fluoride application. ***2-composite resin4-leave and observe

104. daily wear of amalgam: 1-3 microgram /DAY ***

105. cracked enamel best Dx by Dye***

106. how can test crack tooth??? Xrayelictric testethyle dye test. ***vitality test

107. Which one of the following was the most frequently reason for replacement of a molar restoration with larger restoration:

a. New caries.b. Recurrent caries.c. Faulty restoration.

All of the above*** .

108. When restoring asymptomatic healthy tooth with amalgam, the normal physiologic symptom after that is: a. Pain on hotb. Pain on cold ***c. Pain on bitingd. Pain on sweet

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109. Patient suffering from a cracked enamel, his chief complain is pain on : A) Hot stimuliB) Cold stimuliC) A & B. ***D) Electric test.

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